This trial is designed to determine the potential interference between the measles vaccine and the Japanese encephalitis vaccine at 12, 24, and 36 months post-vaccination. As these vaccines will be used in routine EPI systems at the same time, similar to how measles and yellow fever vaccine (also a Flavivirus) are administered, it is imperative to collect long-term data showing that neither vaccine interferes with seroconversion of the other when co-administered.This information will help to ensure subject safety and facilitate programmatic efficiency, reducing the number of immunization visits for both parents and health care workers.